The next update to CRAN R, version 2.10.1, will be released on December 14 according to this r-announce mailing list posting from R Core member Peter Dalgaard. As usual for point-releases, this update will focus on bug fixes and minor improvements. Binary versions for Windows, Mac and Linux are typically released a few days after the source release.
Update: As noted by R-core member Duncan Murdoch in the comments below, there's no such thing as "CRAN R", and the R project shouldn't be confused with the network of sites that distributes it. Duly noted, and thanks to Duncan for the correction.
r-announce: R 2.10.1 Scheduled for December 14, 2009